... ), ≤%0.0010.0005Oxalate(As H2C2O4), ≤%0.030.01Loss on drying,10-14%≤14(180°C,4h%)Fluoride,≤ppm3030Arsenic(As),≤ppm--1Lead ... (Hg),≤ppm--1Carbonates--Dissolving 1 g of calcium citrate in 10 ml 2 N hydrochloric acid mustnot liberate more than a few ...